diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 8dbb8faa..d8abdeb2 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -2232,7 +2232,7 @@ class File_X509 {
     function getDN($format = FILE_X509_DN_ARRAY, $dn = NULL)
     {
         if (!isset($dn)) {
-            $dn = isset($this->currentCert['tbsCertList']) ? this->currentCert['tbsCertList']['issuer'] : $this->dn;
+            $dn = isset($this->currentCert['tbsCertList']) ? $this->currentCert['tbsCertList']['issuer'] : $this->dn;
         }
 
         switch ((int) $format) {